J. M. Coetzee um Norman Mailer um Adolf Hitler:

All in all, the adventures of Adolf Hitler in the realm of ideas provide a cautionary tale against letting an impressionable young person loose to pursue his or her education in a state of total freedom. For seven years Hitler lived in a great European city in a time of ferment from which emerged some of the most exciting, most revolutionary thought of the new century. With an unerring eye he picked out not the best but the worst of the ideas around him. Because he was never a student, with lectures to attend and reading lists to follow and fellow students to argue with and assignments to complete and examinations to sit, the half-baked ideas he made his own were never properly challenged. The people he associated with were as ill-educated, volatile, and undisciplined as himself. No one in his circle had the intellectual command to put his chosen authorities in their place as what they were: disreputable and even comical mountebanks.

Normally a society can tolerate, even look benignly upon, a layer of autodidacts and cranks on the fringes of its intellectual institutions. What is singular about the career of Hitler is that through a confluence of events in which luck played some part, he was able not only to spread his nonsensical philosophy among his German countrymen but to put it into practice across Europe, with consequences known to all.